<template>
  <!-- 底部部分 => list有数据的时候，才展示  list.length > 0 -->
  <footer class="footer" v-if="list.length > 0 ">
    <span class="todo-count"
      ><strong>{{ leftCount }}</strong
      >剩余</span
    >
    <ul class="filters">
      <li>
        <a @click="filter('all')" :class="{selected:type==='all' }" href="#/">全部</a>
      </li>
      <li>
        <a @click="filter('active')" :class="{selected:type==='active' }" href="#/active">进行中</a>
      </li>
      <li>
        <a @click="filter('completed')" :class="{selected:type==='completed' }" href="#/completed">已完成</a>
      </li>
    </ul>
    <!-- 有已完成的任务，才需要显示这个按钮 -->
    <button v-if="itemShow" @click="clear" class="clear-completed">
      清除已完成
    </button>
  </footer>
</template>

<script>
export default {
  props: {
    list: Array,
    type: String
  },
  data() {
    return {
      // type: "all",
    };
  },
  computed: {
    leftCount() {
      return this.list.filter((item) => item.flag === false).length;
    },
    itemShow() {
      return this.list.some((item) => item.flag === true);
    },
  },
  methods: {
    clear() {
      this.$emit("clear");
    },
    filter(type) {
      // this.type = type;
      this.$emit("changeType", type);
    },
  },
};
</script>

<style></style>
